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TESTING FOR INSTRUMENTATION IN TRANSPORTATION TIME SERIES DATA: A CASE STUDY.
| 题名： | TESTING FOR INSTRUMENTATION IN TRANSPORTATION TIME SERIES DATA: A CASE STUDY. |
| 作者： | Rock-SM |
| 关键词： | TIME-SERIES-DATA; MEASURING-METHODS; CHANGES-; VALIDITY-; CASE-STUDIES; ILLINOIS-; ACCIDENT-STATISTICS |
| 摘要： | Instrumentation (a shifting of a measuring instrument independent of any change in the phenomenon being measured) is one of the threats to the validity of experiments. Four possible cases of instrumentation in a time series of traffic accident statistics in Illinois since the mid-1970s were tested, primarily by using autoregressive integrated moving average methods. Two of these cases, a 1977 change in the reporting threshold for property-damage-only (PDO) accidents and a 1989 change in the definition of a fatality, were not found to be significant. A 1989 change in the method of tabulating monthly data and a 1992 change in the reporting threshold for PDO accidents were statistically significant. These two cases combined could account for a more than 15% decline in PDO accidents. |
| 总页数： | Transportation Research Record. 1997. (1581) pp89-92 (2 Fig., 2 Tab., 11 Ref.) |
| 报告类型： | 科技报告 |
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